On Saturday, January 31, 2015 at 8:30:20 AM UTC-8, Nels Nelson wrote:
>
> On Thursday, January 29, 2015 at 4:39:20 PM UTC-6, Nels Nelson wrote:
>>
>> On Thursday, January 29, 2015 at 3:41:27 PM UTC-6, Jeremy Evans wrote:
>>>
>>> Could you try adding the :instance_specific => true option when defining
>>> the tags association and see if the problem still occurs?
>>>
>> Yes, I will definitely try that. Code is running now with those editions.
>>
>
> Yes, it still occurs.
>
> I let the program run for 48 hours, and it only occurred once.
>
That's helpful. That means the problem is probably not related to the
placeholder loader (which is used in the general case).
>
> In the method which attempts to access thing.tags, I am doing this:
>
> def get_tag_names
> log.error "Why is #{self}.tags nil?" if tags.nil?
> tags.compact.map(&:to_s)
> end
>
> This code gets invoked at least once every second. I may try to invoke it
> more often, to see if I can coax the error to occur more frequently.
>
> Oddly, the second tags invocation almost never returns nil, only the first
> invocation in the conditional. Of course, without the pre-check for
> tags.nil?, that second invocation would fail with a NoMethodError since
> NilClass hasn't defined #compact().
>
> I'm not sure why two threads would ever be accessing the same model
> instance. Is it possible that a navigation with rcte_tree might return the
> exact same object in memory as a different tree navigation in another
> thread?
>
I don't think that should be possible.
If I had to guess, the problem is related to rcte_tree and not the general
associations code. Can you show how you are loading the object that is
calling tags when tags is nil? Is it from an rcte_tree association, was it
eager loaded, did it load the tags association earlier (eagerly or not)?
Obviously, a self contained example would be great, but considering how
rarely the problem seems to occur, I can see how putting one of those
together would be difficult.
Thanks,
Jeremy
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